iPad - Rogue Petals
The easiest way to use this as a Lock Screen or Home Screen on the iPad is to go to this web page in Mobile Safari on the iPad, tap the photo to download the original, when the original has downloaded press and hold on it until the iPad asks if you want to "Save Image" or "Copy"; select Save Image, then press the home button (the physical button on the face by the dock connector). Next open the Settings > Brightness & Wallpaper, tap the Wallpaper section that has two thumbnails of what you're currently using, tap Saved Photos, tap the photo you want to use (since these are already cropped to the right size you shouldn't need to adjust them at all). Finally tap "Set Lock Screen", "Set Home Screen", or "Both" whichever you prefer. That's it you're done. Please Enjoy.